[PATCH] Fix overflow checking extension versions

[Keith Packard]

Robert Ancell <robert.ancell at canonical.com> writes:

> The easiest way to check for the version of an extension is to send the maximum
> possible version numbers in the QueryVersion request. The X server overflows on
> these as it assumes you will send a reasonable version number.

Merged.
   4cbd3fa..0df871c  master -> master

-- 
keith.packard at intel.com
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